Red spots on tree leaf - seems to be some kind of infection covering this leaf and several others. I think that the tree is a young oak, although the leaf shape isn't typical oak admittedly.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Lat/Lng: 51.5, -2.6
OS grid ref: ST6282